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Natural Yellow Diamonds

A natural yellow diamond is a diamond coloured by nitrogen in its crystal lattice, graded as a fancy colour once its yellow is stronger than Z on the GIA scale. Yellow is the most available fancy colour, which makes saturation the whole question: Fancy Vivid yellows are scarce while lighter grades are plentiful. Byrex Gems offers natural yellow diamonds to the trade from Toronto, most with GIA reports and each filmed unedited, with prices shown to approved buyers and viewings by appointment.

Where to buy natural yellow diamonds in Toronto

Byrex Gems lists 353 natural yellow diamonds online today. 348 of them come with a report from laboratories including GIA, AIG and HRD. Viewings are at our Toronto office, 27 Queen Street East, Suite 407, steps from Queen subway station, by appointment. We have supplied coloured gemstones and natural fancy colour diamonds to jewellers and designers since 1988, and welcome private clients by appointment. Prices are shown to approved trade accounts; private clients can ask us on WhatsApp, where we reply within 12 hours, or by email within 24 hours. Every stone ships insured, worldwide.

What is a natural yellow diamond?

Yellow is the one fancy colour caused by the most common impurity in diamond. Nitrogen atoms replace carbon in the lattice and absorb blue light, leaving yellow. In most diamonds the nitrogen is grouped in clusters, giving the pale tints that run down the D to Z scale; these are known in the trade as the cape series, after the Cape of Good Hope stones that first showed them. When nitrogen is present as single, isolated atoms, as in type Ib diamonds, the absorption is stronger and the yellow can be intense.

The D to Z scale and the fancy scale meet at Z. A yellow diamond with more colour than the Z master is a fancy yellow, beginning at Fancy Light, and from there the grades climb through Fancy, Fancy Intense and Fancy Vivid.

Sources are wider than for any other fancy colour. South Africa has produced yellow since the nineteenth century. Zimmi in Sierra Leone is known for small type Ib stones of remarkable saturation. The Ellendale mine in Western Australia supplied a large share of the world's fancy yellows until it ceased production in 2015. Canada's Ekati and Diavik mines in the Northwest Territories have yielded fancy yellows in small numbers.

How GIA grades yellow and what canary means

GIA grades a yellow diamond on the fancy scale from Fancy Light through Fancy, Fancy Intense and Fancy Vivid, with Fancy Deep and Fancy Dark for stones whose tone is darker. Lighter yellows below the Z threshold receive a letter grade on the D to Z scale instead. The hue line may carry a modifier: brownish yellow, greenish yellow, orangy yellow and orange-yellow all appear, and the last hue named is the dominant one. A grade that reads Fancy Vivid Yellow with no modifier is what the trade means by a pure yellow.

Canary is not a laboratory grade. It is a trade and retail term for a strongly saturated yellow, usually applied to Fancy Intense and Fancy Vivid stones, and a report will never use it.

The report states colour origin. Yellow can be produced by irradiation and annealing, and HPHT treatment can turn some brownish stones yellow or yellowish green, so the natural origin line matters even in this common hue. Laboratories detect treatment by inclusions, spectra and trace-element chemistry, and any treatment must be disclosed. Laboratory-grown yellow diamonds are also common and are identified as such.

What a jeweller should check before buying

Confirm the report and the inscription, then look at the colour as it will arrive. Yellow depends on cut more than any other fancy colour. Radiant and cushion cuts, with their many small facets near the girdle, keep light bouncing inside the stone and deepen the yellow; this is why most strong yellows are cut in these shapes. Round brilliants return more white light and can drop a stone a grade in appearance, so a round of the same report grade often looks paler.

Clarity is secondary to colour, but yellow is often clean enough that VS and better is achievable at the same price tier, and buyers expect it in larger stones. Fluorescence should be noted; strong blue fluorescence can make a yellow look lighter outdoors.

Yellow is the fancy colour in which pairs, trios and calibrated side stones are realistic. Matching is done on grade, modifier and tone first, then shape and size, and Byrex keeps pairs and close matches in the common grades. For setting, yellow gold prongs and a yellow gold cup deepen a lighter stone, while white metal makes a Vivid read bright and clean.

What drives the value of a yellow diamond

Saturation decides almost everything in yellow. A Fancy Vivid is worth far more than a Fancy Light of the same weight, and the steps between Fancy, Fancy Intense and Fancy Vivid are the largest in the hue. Because yellow is the most available fancy colour, the market is selective about purity: a pure yellow leads, orangy and orange-yellow stones are often valued close to it for their warmth, while greenish yellow is judged case by case and brownish yellow sits below.

Size counts in the usual stepped way. Fancy Vivid yellows above a few carats are uncommon, and large stones with strong colour appear at auction rather than in stock. Within a colour grade, clarity, cut quality and the absence of strong fluorescence refine the price, and a well cut radiant that looks a grade stronger than its report will sell ahead of a round that looks a grade weaker.

Yellow is also the hue with the most liquid trade market. Pairs and calibrated goods have a steady demand from jewellers, and a Vivid yellow is one of the few fancy colours a retail customer will ask for by name. Byrex shows full trade prices to approved accounts, keeps larger yellows on request and does not publish prices.

Famous yellow diamonds and the supply picture

The Tiffany Yellow is the best known yellow diamond in the world. Found in the Kimberley mines of South Africa in the 1870s and bought by Charles Lewis Tiffany, it was cut as a cushion with extra facets to hold its colour and has been worn only a handful of times. The Allnatt, a cushion-cut Fancy Vivid yellow named after the British collector who owned it, has appeared at auction and in museum loans.

Supply today is steadier than for any other fancy colour, but it has narrowed. Ellendale's closure in 2015 removed a dependable source of fine Fancy yellows, and Zimmi's type Ib stones arrive in small sizes and irregular lots. South Africa, Angola, Russia and Canada continue to produce. The result is a market with plenty of Fancy Light and Fancy stones and a persistent shortage of clean, well cut Fancy Intense and Fancy Vivid goods, especially in pairs and above two carats.

Laboratory-grown yellow diamonds are now widely available at low cost, which has sharpened the distinction: natural Vivid yellow with a GIA report is a different product, and the report is what separates them.

Buying yellow diamonds from Byrex Gems

Byrex Gems has been in Toronto since 1988, and more than seven thousand trade customers in Canada and abroad have bought from us. Many of our yellow diamonds come with reports from GIA and other leading laboratories; all of them are filmed in our office, unedited and unfiltered.

Approved trade buyers see prices online. Others may write at any hour: WhatsApp +1 (437) 450-3786 is answered within hours and email to info@byrex.com the same day, seven days a week. What is listed is a part of what we hold: more yellow diamonds are kept in the vault, and what we do not hold ourselves we can source through our offices worldwide. Private viewings are arranged by appointment in Toronto, Hong Kong, Bangkok and Dubai.

Natural Yellow Diamonds: questions buyers ask

Where can I buy natural yellow diamonds in Toronto?

What makes a yellow diamond a fancy yellow?

Its colour is stronger than the Z master on the GIA scale. Below that threshold a yellowish diamond receives a letter grade; above it the stone is graded Fancy Light, Fancy, Fancy Intense or Fancy Vivid yellow.

Is canary a GIA grade?

No. Canary is a trade term for a strongly saturated yellow, usually a Fancy Intense or Fancy Vivid. GIA reports never use it, so a buyer should always read the report grade behind the word.

Why are most yellow diamonds radiant or cushion cut?

Because those cuts hold colour. Their many small facets keep light inside the stone and deepen the yellow, while round brilliants return white light and look paler. A radiant can appear a grade stronger than a round of the same report grade.

Are natural yellow diamonds ever treated?

Natural yellow diamonds are not. Yellow can be produced by irradiation and annealing, or by HPHT treatment, and laboratory-grown yellows are common. Treatment must be disclosed, and the colour origin line on a GIA report states whether colour is natural.

Does Byrex keep matched pairs of yellow diamonds?

Yes. Yellow is the fancy colour in which pairs and close matches are most achievable, and Byrex keeps them in the common grades for earrings and side stones. Pairs are matched on grade, modifier, tone, shape and size.

Do the yellow diamonds have GIA reports?

Most do. GIA grades the majority of our yellow diamonds, and the report wording is quoted on each stone page. Smaller calibrated goods may carry reports from other recognised laboratories, which is stated.

Does Byrex sell yellow diamonds to private clients?

Yes. Byrex sells first to jewellers and designers, but private clients are welcome by appointment at 27 Queen Street East in Toronto, where yellows can be compared under daylight-equivalent light and reserved for a jeweller to set.

Can I view yellow diamonds in Toronto?

Yes. Viewings are by appointment at 27 Queen Street East, Suite 407, Toronto. Stones can be compared side by side, which is the only reliable way to see the difference between Fancy Intense and Fancy Vivid.

Byrex Gems, 27 Queen Street East, Suite 407, Toronto. Coloured gemstones and natural fancy colour diamonds for the trade since 1988, and for private clients by appointment.

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